Mutant Hovel - Cost: $N/A
Provides the best anti-infantry and anti-air infantry in the game; the Mutant Marauder.

Tiberium Spike - Cost: $N/A
These towers are equipped with a large gatling cannon to harass passing enemies.

Expansion Point - Cost: $N/A
The expansion point grants you ground control over the surrounding area, allowing you to construct buildings without the need for an expansion unit (such as the Nod Emissary).